Abstract
For the analysis of the aerodynamic characteristics of the buildings immersed in the atmospheric boundary layer (ABL), it is necessary to generate a turbulence velocity field with similar temporal and special characteristics to the ABL to obtain a reliable result. In this paper, an improved precursor simulation method called the recycling and reshaping method (RRM) is proposed to generate a turbulent boundary layer in an LES model. The laminar inflow is firstly disturbed by the virtual roughness blocks realized by adding drag force term in the momentum equation, then the inflow velocity profile is reshaped every several steps to adjust the streamwise velocity profile in the downstream target area to meet the requirements. The final turbulence field generated by RRM with virtual roughness blocks is in good agreement with the target velocity conditions. Then, the simulation of the wind-induced pressure on an isolated low-rise building surface is carried out, using the generated turbulence boundary layer as inflow. The comparison between numerical results and TPU aerodynamic database shows that the time-averaged wind-induced surface pressure obtained by LES can be considered in good accordance with the measurements over the whole building surface. However, the non-ignorable deviations for the fluctuating pressure result in the flow separation corners still exist.
Highlights
Before the design and construction of a building, the evaluation of wind-induced responses is an important safety indicator in the present civil engineering applications
For the buildings immersed in the atmospheric boundary layer (ABL), the aerodynamics response on buildings is greatly affected by the turbulent inflow boundary conditions in terms of the mean velocity profiles, the turbulence intensity, and integral length scales, and many studies have reported to focus on the influence of inflow turbulence on building and structure response [8,9]
It is obvious that a turbulence velocity field with similar temporal and special characteristics to ABL should be generated as an inflow condition to obtain a reliable simulation result
Summary
Before the design and construction of a building, the evaluation of wind-induced responses is an important safety indicator in the present civil engineering applications. To improve the numerical efficiency, Kota et al [12] used the drag force model to express the fluid force of physical obstacles in order to avoid the generation of extra grids, and the same idea is adopted by Liu et al [13] to build the virtual roughness blocks by adding source term in the momentum equation to generate a required turbulence boundary layer. Another main disadvantage of this method is the low efficiency to modify the distribution of roughness elements.
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